This extra curiosity is the beginning of admiration for the place. Why? Well, we think it's because there's a hint that the speaker recognizes that this place is more than just a grease trap. It could very well be a home.
Why the extraneous plant? Why the taboret? Why, oh why, the doily? (28-30)
The speaker can hardly believe this family cares enough to keep a plan in this dump. There's something admirable in that, right? The fact that these people still strive to make a spruced up home in this not-so awesome setting is an effort worth commending.
Somebody loves us all. (41)
Seeing all of these small details—this family trying to make a home out of a greasy, oily filling station—has really left a mark on our speaker. Perhaps she admires them for what she couldn't do—see a diamond in the rough.